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72003 High-Power Gearbox Kit

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The Tamiya 72003 high-power gearbox can be built in a gear ratio of 41.7:1 or 64.8:1, making it well-suited for most vehicles that require a balance of speed and torque.

The low-voltage motors in the high-power gearbox run on 1.5-4.5 volts and draw up to a few amps, making them perfect candidates for the DRV8833 motor driver carrier. Motor overheating can be caused by excessive stalling, even at very low voltages. We recommend that you use stall-detection sensors, or just watch your robot, to make sure that it doesn’t stall for more than a few seconds at a time.

This gearbox has a 4 mm diameter, round output shaft, which works with the wheels that are compatible with Tamiya 4 mm, round shafts. Our 3 mm universal mounting hub also fits on the smaller threaded end of the shaft, although it is not specifically intended to work with this type of shaft (the hub’s set screw could damage the thread on the shaft).

For motor specs, see the Mabuchi motor RE-260 (#2295) data sheet (59k pdf). To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison.

Note: The high-power gearbox is a kit; assembly is required. To use the kit in robotics projects, you need to connect the motors to your own robot controller.

Specifications

Typical operating voltage3 V
Gear ratio options41.7, 64.8 :1
No-load motor shaft speed @ 3V9400 rpm [1]
No-load current @ 3V150 mA [2]
Stall current @ 3V2700 mA
Motor shaft stall torque @ 3V0.97 oz·in [3]
  1. A theoretical speed of the gearbox output shaft can be computed by dividing this speed by the gear ratio.
  2. This is the no-load current of the motor when disconnected from the gears in the gearbox; the no-load current of the entire gearbox with the motor connected will be slightly higher and will vary depending on the gear ratio.
  3. A theoretical torque of the gearbox output shaft can be computed by multiplying this torque by the gear ratio.

Resources

Tamiya Gearbox Gear Ratio Comparison
Table comparing the gear ratios available in the many different Tamiya gearboxes we carry.
Mabuchi motor RE-260 datasheet (see model #2295)

This product was added to our catalog on March 27, 2009